Plate-glass inspection clamp



Sept. 16 1924. 1,508,468

G. w. oAKEs PLATE. GLASS INSPECTION CLAMP l Filed April 18, 1.922 FIEJ.. F|E.Z.. FIEI. FIEF- 'u l w-Z JVT Fl/4 4 P o l Il O I E oo i H ea i r 1| i l: 1 i 'L5V :"L /M FIGB?. 'W @W Patented Sept. I6, 1924.l

UNITE-D us-'IATES- yPATENT GEORGE OAKES, 0F CRYSTAL ICI-TY, MISSQURI, .ASSIGNOR T0 PITTSBURGH PLATE i GLASS COMPANY, `A C/ORPORATIO'N -OF PENNSYLVANIA.

` -PLLATEGLAss INSPECTION CLAMP.

Application inea April 1s, 1922. serial No. 555,379.

ToaZZwhmnz'tmag/concem:

Be it known'that I, GEORGE OAKEs, a citizen of the United States,-and a resident of Crystal City, in the county of J eerson and State of Missouri, have made a new and useful invention in Improvements in Plate-Glass Inspection Clamps, of which the following is a specification.

The invention relates to clamps for use in examining or inspecting plate glass. In inspecting such glass, the sheets are placed in vertical position so as to get a proper application of 4light thereto and carefully'examined for. the location of defects and to determine the grades'.l The present invention is designed to provide a simple means which is easily operated for holding the sheets securely in upright position during the process of examination. One embodiment o'f-the invention is illustrated in the accompanying drawings wherein:

Figure 1 isa front elevation of theclamp -in position of use engaging one edge of a sheet of glass. Fig. 2 is an edge elevation. Figs. 3 to 7 are detailed views .of parts of the clamp and Fig. 8 is a transverse section through one of the clamping members on ,the clamping frame.

. Figs..1and 2 illustrate only one of the clamps which are employed in holding .a sheet of glass A in vertical position for inspection urposes, -the other clamp being located at t e other end of the sheet and being the same in construction asthe one shown in Figs. 1 and 2.- The clamp is pivotally mounted on the post 1, and comprises 'a .vertical angle 2 and three engaging members 3, 4 and 5 which are riveted to'the angle 2 and which are adapted to engage the edge of the sheet when the clamp is in the position of Fig. 1. These members 3, 4 vand 5 are provided on their faces next to the glass with' felt pads 6 to yieldingly engage the glass.

The angle frame member 2 has one flange at leach end bent in as indicated at 7 (Fig. 4), which ends are perforated and adapted to receive the pivot rod 8. The post 1 carries a pair of eye bolts 9, which are screwed into the post above and below the ends of the frame member 2 with their eyes in align'- ment with the perforations in the flange at 7, so that when the rod 8 is inserted through the eye bolts and the endsof the angle 2, a

pivotal support is provided.

Projecting beneath the lower end ofy the clamp and secured to ,the post is the catch 10 shown in detail in Fig. 6, such catch beingprovlded with the inclined surface 11.

The lower clamping member 5 carries the latch 12 pivoted at 13 and provided with an end 14 for engaging a stoppin 15 on the member 5 when the 'latch reaches the position indicated in Fig. 2. .The latch is also I i provided with an engaging part 16 adapted to engage'the surface 11 on the catch 10 when the latch is swung to locking position.

This portion 16,y in its movement to locking position first engages the surface 11 at its upper end, and as'the latch moves down a camming effect issecured, causing the clam' to swing around its pivot 8 'so that the feit covered faces of the members 3, 4 and 5 yieldingly engage the glass, pressing itagainst the post. When thelatch reaches the'position of Fig. 2, it is in full locking position and the relation of the pivot 13 to the surface 11 is-such that; the latch will maintain itself in this position. In order to 'sheet of glass to be examined along one of its vertical edges, a `clamping frame hin ed to theI post and adapted'to swing to holding position over said edge, and cooperating cam clamping means onthe post and frame for causing the frame to press upon the glass and for securing the frame in such position,

said clamping means being arrangedv to positively lock the clamping frame in operative position.

2. In combination -in a glass supporting device, a vertical post adapted to engage a .sheet of glass to be examined along one of its vertical edges, a clamping frame hinged to the -post and adapted to swingto holding posit-ion over said edge, a catch member se cured to the post beneath the frame 'and a pivoted latch carried at the lower end of the frame and adapted to engage the catch when the frame is in holding posit-ion.

3. In combination in a glass supporting device, avertical post adapted to engage a auv sheet of glass to be examined along one of its vertical edges, a clamping frame hinged to the post and adapted to swing to holding position over said' edge, a catch member secured to the post beneath the frame having an inclined locking surface, and a latch vpivoted to the lower end of the frame for move# ment transversely of the catch and adapted.

to engage saidl locking surface, so that the frame is cammed inward against the glass l@ when the latch is swung to locking position. in testimony whereof, have hereunto Ysubscribed my name this lst day of April,

enonen W. oams., 

